Commit cc4673ee authored by Corey Minyard's avatar Corey Minyard Committed by Linus Torvalds

[PATCH] ipmi: watchdog parms in sysfs

Modify the IPMI watchdog parameters (the ones that make sense) to be exported
from sysfs.  This is somewhat complicated because these parameters have
side-effects that must be handled.
Signed-off-by: default avatarCorey Minyard <minyard@acm.org>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c4edff1c
......@@ -47,6 +47,8 @@
#include <linux/reboot.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/string.h>
#include <linux/ctype.h>
#ifdef CONFIG_X86_LOCAL_APIC
#include <asm/apic.h>
#endif
......@@ -158,27 +160,120 @@ static struct fasync_struct *fasync_q = NULL;
static char pretimeout_since_last_heartbeat = 0;
static char expect_close;
static DECLARE_RWSEM(register_sem);
/* Parameters to ipmi_set_timeout */
#define IPMI_SET_TIMEOUT_NO_HB 0
#define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1
#define IPMI_SET_TIMEOUT_FORCE_HB 2
static int ipmi_set_timeout(int do_heartbeat);
/* If true, the driver will start running as soon as it is configured
and ready. */
static int start_now = 0;
module_param(timeout, int, 0);
static int set_param_int(const char *val, struct kernel_param *kp)
{
char *endp;
int l;
int rv = 0;
if (!val)
return -EINVAL;
l = simple_strtoul(val, &endp, 0);
if (endp == val)
return -EINVAL;
down_read(&register_sem);
*((int *)kp->arg) = l;
if (watchdog_user)
rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
up_read(&register_sem);
return rv;
}
static int get_param_int(char *buffer, struct kernel_param *kp)
{
return sprintf(buffer, "%i", *((int *)kp->arg));
}
typedef int (*action_fn)(const char *intval, char *outval);
static int action_op(const char *inval, char *outval);
static int preaction_op(const char *inval, char *outval);
static int preop_op(const char *inval, char *outval);
static void check_parms(void);
static int set_param_str(const char *val, struct kernel_param *kp)
{
action_fn fn = (action_fn) kp->arg;
int rv = 0;
const char *end;
char valcp[16];
int len;
/* Truncate leading and trailing spaces. */
while (isspace(*val))
val++;
end = val + strlen(val) - 1;
while ((end >= val) && isspace(*end))
end--;
len = end - val + 1;
if (len > sizeof(valcp) - 1)
return -EINVAL;
memcpy(valcp, val, len);
valcp[len] = '\0';
down_read(&register_sem);
rv = fn(valcp, NULL);
if (rv)
goto out_unlock;
check_parms();
if (watchdog_user)
rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
out_unlock:
up_read(&register_sem);
return rv;
}
static int get_param_str(char *buffer, struct kernel_param *kp)
{
action_fn fn = (action_fn) kp->arg;
int rv;
rv = fn(NULL, buffer);
if (rv)
return rv;
return strlen(buffer);
}
module_param_call(timeout, set_param_int, get_param_int, &timeout, 0644);
MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
module_param(pretimeout, int, 0);
module_param_call(pretimeout, set_param_int, get_param_int, &pretimeout, 0644);
MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds.");
module_param_string(action, action, sizeof(action), 0);
module_param_call(action, set_param_str, get_param_str, action_op, 0644);
MODULE_PARM_DESC(action, "Timeout action. One of: "
"reset, none, power_cycle, power_off.");
module_param_string(preaction, preaction, sizeof(preaction), 0);
module_param_call(preaction, set_param_str, get_param_str, preaction_op, 0644);
MODULE_PARM_DESC(preaction, "Pretimeout action. One of: "
"pre_none, pre_smi, pre_nmi, pre_int.");
module_param_string(preop, preop, sizeof(preop), 0);
module_param_call(preop, set_param_str, get_param_str, preop_op, 0644);
MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: "
"preop_none, preop_panic, preop_give_data.");
module_param(start_now, int, 0);
MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as"
"soon as the driver is loaded.");
module_param(nowayout, int, 0);
module_param(nowayout, int, 0644);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
/* Default state of the timer. */
......@@ -294,11 +389,6 @@ static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg,
return rv;
}
/* Parameters to ipmi_set_timeout */
#define IPMI_SET_TIMEOUT_NO_HB 0
#define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1
#define IPMI_SET_TIMEOUT_FORCE_HB 2
static int ipmi_set_timeout(int do_heartbeat)
{
int send_heartbeat_now;
......@@ -732,8 +822,6 @@ static struct miscdevice ipmi_wdog_miscdev = {
.fops = &ipmi_wdog_fops
};
static DECLARE_RWSEM(register_sem);
static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg,
void *handler_data)
{
......@@ -839,6 +927,7 @@ static struct nmi_handler ipmi_nmi_handler =
.handler = ipmi_nmi,
.priority = 0, /* Call us last. */
};
int nmi_handler_registered;
#endif
static int wdog_reboot_handler(struct notifier_block *this,
......@@ -921,59 +1010,86 @@ static struct ipmi_smi_watcher smi_watcher =
.smi_gone = ipmi_smi_gone
};
static int __init ipmi_wdog_init(void)
static int action_op(const char *inval, char *outval)
{
int rv;
if (outval)
strcpy(outval, action);
if (!inval)
return 0;
if (strcmp(action, "reset") == 0) {
if (strcmp(inval, "reset") == 0)
action_val = WDOG_TIMEOUT_RESET;
} else if (strcmp(action, "none") == 0) {
else if (strcmp(inval, "none") == 0)
action_val = WDOG_TIMEOUT_NONE;
} else if (strcmp(action, "power_cycle") == 0) {
else if (strcmp(inval, "power_cycle") == 0)
action_val = WDOG_TIMEOUT_POWER_CYCLE;
} else if (strcmp(action, "power_off") == 0) {
else if (strcmp(inval, "power_off") == 0)
action_val = WDOG_TIMEOUT_POWER_DOWN;
} else {
action_val = WDOG_TIMEOUT_RESET;
printk(KERN_INFO PFX "Unknown action '%s', defaulting to"
" reset\n", action);
}
else
return -EINVAL;
strcpy(action, inval);
return 0;
}
static int preaction_op(const char *inval, char *outval)
{
if (outval)
strcpy(outval, preaction);
if (!inval)
return 0;
if (strcmp(preaction, "pre_none") == 0) {
if (strcmp(inval, "pre_none") == 0)
preaction_val = WDOG_PRETIMEOUT_NONE;
} else if (strcmp(preaction, "pre_smi") == 0) {
else if (strcmp(inval, "pre_smi") == 0)
preaction_val = WDOG_PRETIMEOUT_SMI;
#ifdef HAVE_NMI_HANDLER
} else if (strcmp(preaction, "pre_nmi") == 0) {
else if (strcmp(inval, "pre_nmi") == 0)
preaction_val = WDOG_PRETIMEOUT_NMI;
#endif
} else if (strcmp(preaction, "pre_int") == 0) {
else if (strcmp(inval, "pre_int") == 0)
preaction_val = WDOG_PRETIMEOUT_MSG_INT;
} else {
preaction_val = WDOG_PRETIMEOUT_NONE;
printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to"
" none\n", preaction);
}
else
return -EINVAL;
strcpy(preaction, inval);
return 0;
}
static int preop_op(const char *inval, char *outval)
{
if (outval)
strcpy(outval, preop);
if (!inval)
return 0;
if (strcmp(preop, "preop_none") == 0) {
if (strcmp(inval, "preop_none") == 0)
preop_val = WDOG_PREOP_NONE;
} else if (strcmp(preop, "preop_panic") == 0) {
else if (strcmp(inval, "preop_panic") == 0)
preop_val = WDOG_PREOP_PANIC;
} else if (strcmp(preop, "preop_give_data") == 0) {
else if (strcmp(inval, "preop_give_data") == 0)
preop_val = WDOG_PREOP_GIVE_DATA;
} else {
preop_val = WDOG_PREOP_NONE;
printk(KERN_INFO PFX "Unknown preop '%s', defaulting to"
" none\n", preop);
}
else
return -EINVAL;
strcpy(preop, inval);
return 0;
}
static void check_parms(void)
{
#ifdef HAVE_NMI_HANDLER
int do_nmi = 0;
int rv;
if (preaction_val == WDOG_PRETIMEOUT_NMI) {
do_nmi = 1;
if (preop_val == WDOG_PREOP_GIVE_DATA) {
printk(KERN_WARNING PFX "Pretimeout op is to give data"
" but NMI pretimeout is enabled, setting"
" pretimeout op to none\n");
preop_val = WDOG_PREOP_NONE;
preop_op("preop_none", NULL);
do_nmi = 0;
}
#ifdef CONFIG_X86_LOCAL_APIC
if (nmi_watchdog == NMI_IO_APIC) {
......@@ -983,18 +1099,48 @@ static int __init ipmi_wdog_init(void)
" Disabling IPMI nmi pretimeout.\n",
nmi_watchdog);
preaction_val = WDOG_PRETIMEOUT_NONE;
} else {
do_nmi = 0;
}
#endif
}
if (do_nmi && !nmi_handler_registered) {
rv = request_nmi(&ipmi_nmi_handler);
if (rv) {
printk(KERN_WARNING PFX "Can't register nmi handler\n");
return rv;
}
#ifdef CONFIG_X86_LOCAL_APIC
printk(KERN_WARNING PFX
"Can't register nmi handler\n");
return;
} else
nmi_handler_registered = 1;
} else if (!do_nmi && nmi_handler_registered) {
release_nmi(&ipmi_nmi_handler);
nmi_handler_registered = 0;
}
#endif
}
static int __init ipmi_wdog_init(void)
{
int rv;
if (action_op(action, NULL)) {
action_op("reset", NULL);
printk(KERN_INFO PFX "Unknown action '%s', defaulting to"
" reset\n", action);
}
if (preaction_op(preaction, NULL)) {
preaction_op("pre_none", NULL);
printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to"
" none\n", preaction);
}
#endif
if (preop_op(preop, NULL)) {
preop_op("preop_none", NULL);
printk(KERN_INFO PFX "Unknown preop '%s', defaulting to"
" none\n", preop);
}
check_parms();
rv = ipmi_smi_watcher_register(&smi_watcher);
if (rv) {
......@@ -1021,7 +1167,7 @@ static __exit void ipmi_unregister_watchdog(void)
down_write(&register_sem);
#ifdef HAVE_NMI_HANDLER
if (preaction_val == WDOG_PRETIMEOUT_NMI)
if (nmi_handler_registered)
release_nmi(&ipmi_nmi_handler);
#endif
......
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